| 摘要 |
PURPOSE:To easily obtain the optical controller which is small in size and highly reliable by laminating an optical function element and an electric circuit on a single substrate. CONSTITUTION:On the optical crystal substrate having the optical function element where propagated light in an optical waveguide 2 is controlled electrically, the electric circuit which performs electric control over the optical function element is formed, and a buffer layer 11 is interposed at least at the place where the optical waveguide 2 and the metal clad part 10 of the electric circuit are superposed one over the other. This buffer layer 11 is made of a material which has a lower refractive index than the substrate and has effect for reducing the propagation loss at the metal clad part 10 until the loss can be ignored as compared with the propagation loss of the optical waveguide 2 itself. Consequently, the optical controller which is small in size on the whole and easily manufactured and has superior reliability is obtained. |
